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The Fourier-transform scanning tunneling spectroscopy (FTSTS) contains richsignals related to the quasiparticle scattering interference and/or thedensity-wave-like orders which are crucial in interpretation of the groundstates and the phase transitions in quasi-2D strongly correlated electronsystems such as cuprate and pnictide high-Tc superconductors. The octet modelhas been used to describe the FTSTS data according to the simplified bananaband model of cuprates in superconducting ground state and worked well deepinside the superconducting dome, but away from the superconducting ground statethe description starts to show severe limitations, such as appearance ofparticle-hole asymmetry of the quasiparticle band as will be discussed later.The first efforts to describe the FTSTS signals based on the fully-phasedGreen's function-based quasiparticle scattering interference theory, howeverlacked the full similarity to the FTSTS data, in part due to the lack ofaccurate information on the tunneling and scattering matrix elements. In thispaper we discuss how the noise due to the potential disorder and the variousartifacts in the raw FTSTS data can be handled by a simple cross-sectionalanalysis with an isotropic Gaussian averaging and modeling the set-point effectby an energy-independent and position-dependent factor to the density of statesfunction. The result shows that in the cross-sectional presentation an enhancedcorrelation exists between the FTSTS data and the theoretical simulation evenwithout the accurate model for the tunneling and the scattering matrix elementsand without the assumption for particle-hole symmetry, suggesting that it canbe a new starting point of a more robust quantum physical analysis frameworkappropriate for the phase transition study in the high-Tc superconductors andother strongly correlated electron systems.

A high-resolution cross-sectional analysis for Fourier-transform  scanning tunneling spectroscopy and fully-phased Green-function-based  quasiparticle scattering theories